crot-f(3)

crot.f –

Synopsis

Functions/Subroutines

subroutine crot (N, CX, INCX, CY, INCY, C, S)
CROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Function/Subroutine Documentation

subroutine crot (integerN, complex, dimension( * )CX, integerINCX, complex, dimension( * )CY, integerINCY, realC, complexS)

CROT applies a plane rotation with real cosine and complex sine to a pair of complex vectors.

Purpose:

 CROT applies a plane rotation, where the cos (C) is real and the
 sin (S) is complex, and the vectors CX and CY are complex.

 

Parameters:

N

 N is INTEGER
 The number of elements in the vectors CX and CY.

CX

 CX is COMPLEX array, dimension (N)
 On input, the vector X.
 On output, CX is overwritten with C*X + S*Y.

INCX

 INCX is INTEGER
 The increment between successive values of CY. INCX <> 0.

CY

 CY is COMPLEX array, dimension (N)
 On input, the vector Y.
 On output, CY is overwritten with -CONJG(S)*X + C*Y.

INCY

 INCY is INTEGER
 The increment between successive values of CY. INCX <> 0.

C

 C is REAL

S

 S is COMPLEX
 C and S define a rotation
 [ C S ]
 [ -conjg(S) C ]
 where C*C + S*CONJG(S) = 1.0.

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 104 of file crot.f.

Author

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